白云鄂博铁—铌—稀土矿床基本地质特征,成矿作用,成矿模式  

The Bayan Obo Fe-Nb-REE-deposit: Its Basic Geological Features, Metallogenesis and Genetic Model

作　　者：侯宗林 

机构地区：冶金工业部天津地质研究院

出　　处：《地质与勘探》1989年第1期1-5,22,共6页Geology and Exploration

摘　　要：矿床位于中国地台北缘,元古界白云鄂博群中.矿体赋存于白云岩中及其上部板岩过渡部位.中早元古代,该区产生了区域性深断裂、东西向海槽和坳陷盆地,沉积了巨厚的类复理石建造.大量的金属、挥发份和碱金属由深断裂带带入盆地,又有陆源物质加入,形成高浓度多种金属的“水体”.在中偏碱性、弱还原条件下,Fe、Nb、REE等元素大量沉淀富集成矿.元古代末期,又经区域变形-变质作用.海西期在区域性花岗岩岩浆影响下,形成以钠、氟交代为主的热液蚀变和稀土元素富集.白云部博矿床是以沉积作用为主、多种地质作用叠加的复杂矿床.The deposit is situated in the Proterozoic Bayan Obo Group on the north margin of the Chinaplatform. Ore bodies are located in dolomite and the transitional layer of the upper slate. During the agefrom the Lower to Middle Proterozoic a regional deep fracture, a east-west striking sea trough and adepression basin were formed and a flyschoid formation of a great thickness was deposited. A largeamount of metals, evaporable constituents and alkali metals were introduced from the deep fracture zone.In addition a' water body' with a high concentration of different metals were fomed by terrigenoussubstance Under a neutral to slightly alkaline weak reducing condition. Fe, Nb and REE were depositedand enriched into deposit. At the late stage of the Proterozoic, it also underwent a regional deformation and metamorphism. In the Hercynian epoch under the influence of regional granitic magma, hydrothermal alteration (chiefly by Na an F metasomatism) and REE cconcentration were occurred. TheBayab Obo deposit is a complex on, chiefly of sedimentary origin and supeimposed different geological functions.

关 键 词：铁 铌 稀土矿床 成矿模式 矿化作用 

分 类 号：P618.705[天文地球—矿床学]